FIGURE 1.

Schematics of test protocols used for the forced-choice alternation task run in a single maze (A–F) and then in two adjacent mazes (G,H). Solid lines indicate the forced sample phase and the dashed lines indicate the correct response in the choice phase. Initial training (A) permitted the use of multiple cue types. The task was then modified to nullify the value of certain cue types. These manipulations included rotating the maze between the sample and choice phase (B,D,E), running the sample phase in the light and the choice phase in the dark (C,D), as well as running both phases in the dark (F,H).